Heat shrinkage copolyester film and preparation method thereof

A technology of copolyester and heat shrinkage, which is applied in the field of highly transparent three-layer co-extrusion copolyester heat shrinkable film and its preparation, can solve the problems of unsatisfactory tensile strength, shrinkage uniformity and toughness, etc., and achieve excellent transparency , Uniform shrinkage and strong stability

Active Publication Date: 2013-07-17
JIANGSU SHUANGXING COLOR PLASTIC NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the film described in the invention has good light transmittance

Method used

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  • Heat shrinkage copolyester film and preparation method thereof
  • Heat shrinkage copolyester film and preparation method thereof

Examples

Experimental program
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Example Embodiment

[0027] Example 1

[0028] Add 5.0Kg purified terephthalic acid, 2.2Kg ethylene glycol, 1.8Kg 1,4-cyclohexane dimethanol (CHDM), 0.1g ethylene glycol antimony catalyst, and 100g calcium carbonate anti-adhesion into a 20L universal reactor Esterification reaction is carried out under the conditions of 230-250℃ and 0.2-0.3Mpa with 10g nanometer calcium acetate additive. After the water output reaches the theoretical value, the system pressure is released to normal pressure. Under these conditions, add 0.03g of triethyl phosphate stabilizer, stir at normal pressure for 6min, after vacuuming, increase the temperature in the reactor to 285℃, and reduce the pressure to below 100Pa. Under these conditions, react for 3h, and finally After polymerizing melt extrusion, pelletizing and drying, PETG copolyester chips for film with intrinsic viscosity of 0.75dl / g are obtained.

[0029] Add 3.5Kg PET prepolymer (esterification of purified terephthalic acid and ethylene glycol) and 2.5Kg PBT prep...

Example Embodiment

[0032] Example 2

[0033] Add 5.0Kg of purified terephthalic acid, 2.4Kg of ethylene glycol, 1.6Kg of 1,4-cyclohexanedimethanol (CHDM), 0.1g of tetrabutyl titanate catalyst, and 120g of calcium acetate to resist adhesion to a 20L universal reactor Binder, 20g nanometer calcium acetate additive, esterification reaction under 230-250℃, 0.2-0.3Mpa conditions, after the water output reaches the theoretical value, the system pressure is released to normal pressure. Under these conditions, add 0.03g of triethyl phosphate stabilizer, stir at normal pressure for 6min, after vacuuming, increase the temperature in the reactor to 285℃, and reduce the pressure to below 100Pa. Under these conditions, react for 3h, and finally After polymerized melt extrusion, pelletizing, and drying, PETG copolyester chips for film with an intrinsic viscosity of 0.80dl / g are obtained.

[0034] Add 3.7Kg PET prepolymer (esterified terephthalic acid and ethylene glycol) and 2.3Kg PBT prepolymer (esterified terep...

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Abstract

The invention discloses a heat shrinkage copolyester film and a preparation method thereof. The heat shrinkage copolyester film is characterized by comprising a surface layer A composed of PETG (polyethylene terephthalate glycol) copolyester, a core layer B composed of PET (polyethylene glycol terephthalate)/PBT (polybutylece terephthalate) copolyester and a bottom layer C composed of PCTG (di-n-octyl phthalate) copolyester. The film-used PETG copolyester slices, film-used PCTG copolyester slices and film-used PET/PBT copolyester slices are obtained through a screw extruder. Compared with regular heat shrinkage copolyester films, the three-layer co-extrusion lateral-stretching heat shrinkage copolyester film has the advantages that the three-layer co-extrusion lateral-stretching heat shrinkage copolyester film has high light transmittance and single hot-shrinkage rate, has good gloss and high stability, can be evenly shrunk, has good transparency, tractility and toughness, can be produced in the existing BOPET (polyester film) film production lines, and is suitable for direct packages of labels of various containers, food and beverage, electric products, machinery or hardware products.

Description

technical field [0001] The invention relates to a heat-shrinkable copolyester film and a preparation method thereof, in particular to a highly transparent three-layer co-extruded copolyester heat-shrinkable film and a preparation method thereof. Background technique [0002] In recent years, the domestic market has a great demand for high-grade heat-shrinkable films. Heat-shrinkable films based on polyvinyl chloride (PVC), polystyrene (PS) or polyethylene terephthalate (PET) have good shrinkage properties when heated, and the above products have been widely used in convenience foods and beverages, Direct packaging of machinery or hardware products. [0003] Since the heat-shrinkable polyvinyl chloride film often produces a large amount of hydrogen chloride and dioxin gas when it is incinerated, it is not conducive to recycling and does not meet environmental protection requirements. Therefore, its application is limited. [0004] Polystyrene heat-shrinkable film has good s...

Claims

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Application Information

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IPC IPC(8): B32B27/08B32B27/36B32B27/20C08G63/183C08G63/199C08G63/78C08G69/44C08L67/02C08L77/12B29C55/04B29C47/00
Inventor 吴培服
Owner JIANGSU SHUANGXING COLOR PLASTIC NEW MATERIALS
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